The Model of Adsorption Isotherm on Reduction of Peroxide Number in CPO (Crude Palm Oil) Using Rubber Fruit Shell (Hevea brasiliensis) as Biosorbent

Abstract

The object of this resesarch was to determine the model of adsorption isotherm on reduction of peroxide number in CPO (Crude Palm Oil) using rubber fruit shell (Hevea brasiliensis) as biosorbent. The pretreatment of activation (carbonating and chemically) was started by washing and drying the rubber fruit shell under the sun. The adsorption process was done by using biosorbent with the highest iodine sorbent dosage and contact time. The highest iodine number was 913.680 mg/g and was obtained at 1:5 biosorbent to KOH 6 N solution ratio. The best reduction of peroxide number was 83.86% at 0.5% biosorbent dose and 40 min of contact time. The model of adsorption isotherm on reduction of peroxide number was realized with dosis of biosorbent 1%, 1.5% and 2% at time of equilibrium 30 min. The model used was Freundlich and Langmuir isotherm. The result was the constant of Langmuir parameter was maximum adsorption capacity (qm) = 0.0009 and adsorption constant (kl) = -130.488. On the other side, the constant parameter of Freundlich was adsorption constant (n) = -0.579 and capacity of adsorption (kf) = 1.169 x 10−6.